public static WAVParser ChangeVolume(WAVParser wavParser, double changeDb)
{
var newSamples = wavParser
.Samples
.Select(channel => ChangeVolume(channel, changeDb))
.ToList();
var outputFile = wavParser.Clone();
outputFile.Samples = newSamples;
return(outputFile);
}
public static WAVParser ChangeSampleRate(WAVParser parser, int newSampleRate)
{
var newFile = parser.Clone(true);
if (newFile.SampleRate == newSampleRate)
{
return(newFile);
}
int hz1, hz2;
{
var nok = NOK((int)parser.SampleRate, newSampleRate);
hz1 = (int)(nok / newSampleRate);
hz2 = (int)(nok / parser.SampleRate);
}
int[] indexes;
double[] rCoefs;
{
var indexesA = new List <int>(hz2);
var rCoefsA = new List <double>(hz2);
for (int j = 0; j < hz2; j++)
{
var coef = j * 1d * hz1 / hz2;
var index1 = (int)Math.Floor(coef);
var r1 = coef - index1;
indexesA.Add(index1);
rCoefsA.Add(r1);
}
indexes = indexesA.ToArray();
rCoefs = rCoefsA.ToArray();
}
var channelFull = new List <List <double> >();
foreach (var channelA in parser.Samples.Select(t => t.ToList()))
{
int maxSampleCount = (int)Math.Ceiling(channelA.Count * 1d * hz2 / hz1);
double[] channel;
{
var fillValue = channelA.Last();
while (channelA.Count % hz1 != 0)
{
channelA.Add(fillValue);
}
channelA.Add(fillValue);
channel = channelA.ToArray();
}
var samplesNew = new List <double>();
channelFull.Add(samplesNew);
for (int i = 0; i < channel.Length - 1; i += hz1)
{
samplesNew.Add(channel[i]);
for (int j = 1; j < hz2; j++)
{
var index1 = indexes[j];
var r1 = rCoefs[j];
var v1 = channel[index1 + i];
var v2 = channel[index1 + 1 + i];
if (v1 == v2)
{
samplesNew.Add(v1);
continue;
}
var value = (1 - r1) * v1 + r1 * v2;
samplesNew.Add(value);
}
}
while (samplesNew.Count > maxSampleCount)
{
samplesNew.RemoveAt(samplesNew.Count - 1);
}
}
newFile.Samples = channelFull;
newFile.SampleRate = (ushort)newSampleRate;
return(newFile);
}
public static WAVParser MergeFiles(
WAVParser file1,
WAVParser file2,
MergeFileAlgorithm algorithm = MergeFileAlgorithm.AverageX2
)
{
var realFile1 = file1.Clone();
var realFile2 = file2.Clone();
if (realFile1.SampleRate > realFile2.SampleRate)
{
realFile2 = ChangeSampleRate(realFile2, realFile1.SampleRate);
}
else if (realFile1.SampleRate < realFile2.SampleRate)
{
realFile1 = ChangeSampleRate(realFile1, realFile2.SampleRate);
}
var mergeMap = new List <List <int> >();
if (realFile1.ChannelCount == realFile2.ChannelCount)
{
for (int i = 0; i < realFile1.ChannelCount; i++)
{
mergeMap.Add(new List <int>()
{
i, i
});
}
}
else
{
if (realFile1.ChannelCount == 1)
{
for (int i = 0; i < realFile2.ChannelCount; i++)
{
mergeMap.Add(new List <int>()
{
0, i
});
}
}
else if (realFile2.ChannelCount == 1)
{
for (int i = 0; i < realFile1.ChannelCount; i++)
{
mergeMap.Add(new List <int>()
{
i, 0
});
}
}
else
{
throw new Exception(string.Format("File 1 has {0} channels. File 2 has {1} channels. Can't merge",
realFile1.ChannelCount, realFile2.ChannelCount));
}
}
var samples = new List <List <double> >();
foreach (var map in mergeMap)
{
var channel1 = realFile1.Samples[map[0]];
var channel2 = realFile2.Samples[map[1]];
samples.Add(MergeSamples(channel1, channel2, algorithm));
}
var newFile = realFile1.Clone();
newFile.Samples = samples;
return(newFile);
}
